Waterproof case for an electronic device

ABSTRACT

The present invention relates to a protective case, in particular a waterproof case for electronic device. The waterproof case comprises a front cover, a back cover, a first sealing plug and a second sealing plug, wherein the front cover is provided with a transparent sheet, a frame and a bottom wrap, and the back cover at least has an open end and a blind end. The good sealing and waterproof performance for the case can be achieved by the close fit between the waterproof strip and groove disposed at both sides&#39; edges of the back cover and the front cover, and the outer locking shell. Moreover, the back cover, the front cover and the outer locking shell can be made of inexpensive material that makes the present invention easy to be manufactured.

FIELD OF THE INVENTION

The present invention relates to a protective case, in particular a waterproof case for electronic device.

BACKGROUND OF THE INVENTION

Electronic devices, such as mobile phone and tablet computer, are more and more popular and multifunctional with the development of science technology, which brings a great convenience to our daily life.

Electronic devices are often used in a humid environment. Its electronic components would be damaged by water if the electronic device is exposed to rain or accidentally dropped into other liquid. Like mobile phone, for example, if water entered the mobile phone in use, that will cause short circuit of its motherboard, whereby the motherboard is very expensive to be replaced. Therefore such damages can be avoided if waterproof measures are taken, this is the reason as to why various and complicated waterproof cases appeared on the market.

SUMMARY OF THE INVENTION

A waterproof case for electronic device is provided by the present invention to overcome the inconveniences of the usage of prior art. The waterproof case of the present invention features excellent sealing performance, convenience and stability, but has no negative influence on functionality or usage of the electronic device.

The technical problem described above is solved by the following technical solutions of the present invention:

An embodiment of the present invention may therefore comprise:

-   -   a front cover, comprising:         -   a transparent sheet at least covering and clinging to the             screen of the electronic device, whereby the screen of the             said electronic device can be used or inputted through the             transparent sheet;         -   a frame disposed around the transparent sheet to enclose the             edges of the electronic device, and a waterproof             groove/strip is provided at the edges of the frame; and         -   a bottom wrap wrapped the edge of the lower part of the             frame, wherein the bottom wrap further comprises a first             opening corresponding to the charger port of the electronic             device and a control button corresponding to the key of the             electronic device.     -   a back cover at least covering the back side and the upper part         of the electronic device, and encasing the electronic device         along with the front cover, comprising:         -   at least an open end and a blind end, wherein a waterproof             strip/groove is set up on the interior walls of at least two             sides' edges of the back cover, when the front cover is             inserted into the back cover, both sides' edges of the frame             of the front cover can be slid into the interior walls of             two sides' edges of the back cover from the open end, and             then the front cover is pushed forward until the bottom wrap             engages with the open end of the back cover, while the             waterproof groove/strip of the front cover engages with the             waterproof strip/groove of the back cover completely so as             to perform a waterproof function; and         -   a second opening corresponding to the headphone jack of the             electronic device;     -   a first sealing plug for plugging the first opening, and     -   a second sealing plug for plugging the second opening.

Alternatively, a waterproof groove can be provided in the surrounding edges of the frame, and the waterproof strip corresponding to the waterproof groove is disposed in the interior walls of the two sides' edges of the back cover and the interior wall of the blind end of the back cover.

Moreover, the waterproof strip and the groove can be swapped from one another, i.e. the waterproof strip can be provided at the edges of the frame, and the waterproof groove corresponding to the waterproof strip can be disposed in the interior walls of two sides' edges of the back cover and the interior wall of the blind end of the back cover.

According to an embodiment of the present invention, the waterproof case further comprises an outer locking shell to improve the waterproof performance, wherein the outer locking shell encases the assembly formed by the front cover and the back cover, and makes the two covers tight enough in order to achieve better waterproof performance.

For better tight connection between the outer locking shell and the back cover, the present invention can be accomplished by two following concepts:

First concept, the outer locking shell further comprises two lateral sides, each of which has a positioning slot for fixing the outer locking shell and the back cover; while a positioning bulge is disposed on each outer side wall of the back cover. When fixing the outer locking shell to the back cover, the positioning bulge will be inserted into the positioning slot of the outer locking shell for tight connection between the outer locking shell and the back cover. Further the positioning slot of the outer locking shell is likely a long narrow slot, and the positioning bulge of the back cover is also long narrow bulge.

Second concept, the outer locking shell further comprises two lateral sides, each of which has a positioning bulge for fixing the outer locking shell and the back cover; while a positioning slot is disposed on each outer side wall of the back cover. When fixing the outer locking shell to the back cover, the positioning bulge will be inserted into the positioning slot for tight connection between the outer locking shell and the back cover. Further the positioning bulge of the outer locking shell is likely a long narrow track, and the positioning slot of the back cover is also long narrow-shaped.

According to an embodiment of the present invention, the outer locking shell has an opening corresponding to the charger port or the headphone jack of the electronic device in order to use the electronic device conveniently upon placing the outer locking shell.

According to an embodiment of the present invention, in order to improve the close fit between the open end of the back cover and the bottom wrap of the front cover, the open end of the back cover is provided with multi-step grooves, and the bottom wrap of the front cover is also provided with multi-step raised platforms corresponding to the multi-step grooves. The multi-step grooves will be joined to the multi-step raised platforms hermetically and the case can be sealed when in use. According to an embodiment of the present invention, the waterproof case can be designed in the following two ways, so that the first opening can be sealed.

As first way, the first sealing plug is of L shape which consists of a horizontal plane member and a vertical member. A locking bulge is disposed on the inner wall of the horizontal plane member to snap the back side of the bottom wrap. The vertical member is of arc-shape corresponding to the curve side of the bottom wrap. A one-piece gasket is disposed on the inner wall of the vertical member to plug the first opening. Moreover, skid-proof strips can be disposed on the outer side of the vertical member in order to operate the L-shaped plug conveniently.

As second way, a square slot is provided around the first opening, and the first opening is within the square slot. The first sealing plug is embedded in the square slot and can be slid within the slot to seal the first opening. Moreover, skidproof strips are provided on the outer surface of the plug in order to make it easy to slide the plug in.

According to an embodiment of the present invention, the second sealing plug is a screw plug made of plastic or rubber.

A transparent lens plastic sheet is provided on the back cover, corresponding to the camera of the electronic device. The transparent lens plastic sheet is a post-forming part in the back cover. A waterproof fabric is also provided on the back cover, corresponding to the speaker of the electronic device.

A transparent plastic sheet is provided on the outer locking shell, corresponding to the camera and speaker of the electronic device. The transparent plastic sheet is a post forming part in the outer locking shell.

An embodiment of the present invention may further comprise:

-   -   (A) a front protective sheet cover, comprising:         -   a transparent sheet at least covering and clinging to the             screen of the electronic device, whereby the screen of the             electronic device can be used or inputted through the             transparent sheet; the said front sheet cover may have one             or more bottom openings that can accommodate the control             button(s) corresponding to the key of the said electronic             device.         -   a frame disposed around the transparent sheet to enclose the             edges of the electronic device, and a waterproof             groove-and-tongue is provided at the edges of the frame.     -   (B) a protective back cover shell, covering the entire back of         the electronic device, and encasing the electronic device around         the edges of the front sheet cover, comprising:         -   an inner back cover, covering the entire back of the             electronic device; wherein a waterproof tongues are set up             on the interior walls of along the edges of the inner back             cover, wherein the front sheet cover is inserted into the             back cover after having attached the electronic device onto             the front sheet cover, while the waterproof grooves of the             front sheet cover completely engages with the waterproof             tongues of the back cover to perform the waterproof             function.         -   an outer locking shell, which is made with hard material,             providing sealing pressures around the sides of the inner             back cover to assure the waterproof functionality of the             complete assembly of the waterproof protective cover. The             outer locking shell should be thick enough to be able to             provide good pressures to perform good waterproof             functionality of the complete protective case.     -   The protective back cover shell further comprises: one or         several openings, which corresponds to one or several positions         of the port(s) of the electronic device.     -   According to an embodiment of the present invention, the said         waterproof protective cover also includes: at least one opening         on the front sheet cover, which is able to accommodate the         waterproof control button, corresponding to the said electronic         device, and the protective back cover shell has at least one or         several opening holes, which are sealed with the sealing plugged         to complete the waterproof functionality.

According to an embodiment of the present invention, the frame of the front cover can be made of soft material or hard material. The back cover can be made of soft material or hard material. The present invention can be made of any kind of inexpensive materials that is being used in the existing cases of an electronic device in the current market.

More advantages can be achieved by the present invention, as following:

-   -   the sealing and waterproof performance can be performed by the         close fit between the waterproof tongue-and-groove at both         sides' edges of the back cover and the front cover respectively;     -   an enclosure configuration is formed by the bottom wrap of the         front cover and the back cover; When assembling the front cover         and the back cover, the front cover can be inserted into the         back cover by holding the bottom wrap, whereby the front cover         can be engaged with the back cover very well so as to achieve a         better sealing and waterproof performance;     -   the back cover and the front cover can be closed fit tightly by         using the outer locking shell, this configuration will improve         its waterproof performance furthermore;     -   the back cover and the front cover can be made of inexpensive         material, so that the cost of the production of the present         invention will eventually be reduced.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front perspective view of the waterproof case according to an embodiment of the present invention.

FIG. 2 is a rear perspective view of the waterproof case according to an embodiment of the present invention.

FIG. 3 is an exploded perspective view of the waterproof case an embodiment of the present invention.

FIG. 4 is a front perspective view of the front cover and the first sealing plug in according to an embodiment of the present invention.

FIG. 5 is a rear perspective view of the front cover and the first sealing plug according to an embodiment of the present invention.

FIG. 6 is a front perspective view of the back cover and the second sealing plug in according to an embodiment of the present invention.

FIG. 7 is a rear perspective view of the back cover and the second sealing plug in according to an embodiment of the present invention.

FIG. 8 is a front perspective view of the outer locking shell according to an embodiment of to the present invention.

FIG. 9 is a rear perspective view of the outer locking shell in according to an embodiment of the present invention.

FIG. 10 is a perspective view of the waterproof case according to an embodiment of the present invention.

FIG. 11 is a front perspective view of the waterproof case according to an embodiment of the present invention.

FIG. 12 is a perspective view of the front sheet cover of the waterproof case according to an embodiment of the present invention.

FIG. 13 is a front perspective view of the inner protective cover shell of the waterproof case according to an embodiment of the present invention.

FIG. 14 is a front perspective view of the outer shell of the waterproof case according to an embodiment of the present invention.

REFERENCE TO THE DRAWINGS

-   -   1: Front cover;     -   11: Transparent sheet;     -   12: Frame;     -   121: Waterproof grooves;     -   13: Bottom wrap;     -   131: First opening;     -   132: Control button;     -   133: Multi-step raised platform;     -   14: Square slot;     -   2: Back cover;     -   21: Open end;     -   211: Multi-step grooves;     -   22: Blind end;     -   23: Waterproof strips;     -   24: Second opening;     -   25: Positioning bulge;     -   3(3′): First sealing plug;     -   31: Horizontal member;     -   32: Vertical member;     -   311: Locking bulge;     -   321: Gasket;     -   322: Skid-proof strips;     -   31′: Skid-proof strips;     -   4: Second sealing plug;     -   5: Outer locking shell;     -   51: Positioning slot;     -   52(53): Openings;     -   6: Lens plastic sheet;     -   7: Waterproof fabric;     -   8: Transparent plastic sheet;     -   100: Protective front sheet cover;     -   110: Transparent sheet;     -   120: Frame;     -   121′: Waterproof grooves;     -   130: First openings;     -   140: Control button;     -   200: Inner back cover;     -   210: Back plate;     -   220: Slot for outer locking shell;     -   221: Waterproof tongues;     -   230: First opening;     -   240: Second opening;     -   250: Volume rocker;     -   300: Outer locking shell;     -   310: Opening slot;     -   320: Opening slot;     -   330: Opening slot     -   400: First sealing plug;     -   500: Second sealing plug;     -   600: Transparent lens;     -   700: Waterproof fabric;     -   800: Transparent plastic sheet.

DETAILED DESCRIPTION

The embodiments of the present invention are described in detail with reference to the drawings. It is appreciated that these preferred embodiments are used to illustrate and explain the present invention, and do not constitute a limitation to the present invention.

An embodiment of the present invention may therefore comprise as follow:

As shown in FIGS. 1, 2 and 3, the waterproof case for electronic device according to the present invention comprises a front cover 1, a back cover 2, a first sealing plug 3 and a second sealing plug 4.

As shown in FIGS. 4 and 5, the front cover 1 comprises the following three parts:

-   -   a transparent sheet 11 at least covering and clinging to the         screen of the electronic device, whereby the screen can be         contacted through the sheet 1; When the screen is a touchscreen,         the electronic device can be operated by touching the         transparent sheet 11; When the screen is a traditional display         type, the electronic device can be operated by pressing the         keyboard through the transparent sheet 11;     -   a frame 12 disposed around the transparent sheet 11 to enclose         the edge of the electronic device, and a waterproof groove 121         is provided in the edge of the frame 12;     -   a bottom wrap 13 wrapped the edge of the lower part of the frame         12, comprising a first opening 131 corresponding to the charger         port of the electronic device, and a control button 132         corresponding to the key of the electronic device.

The back cover 2 of the waterproof case according to the present invention is used for at least covering back side and upper part of the electronic device, and encasing the electronic device along with the front cover 1. As shown in FIG. 6 and FIG. 7, the back cover 2 has an open end 21 and a blind end 22, wherein a waterproof strip 23 is set up on the interior walls of edges of the back cover 2 and the interior wall of the blind end 22. The waterproof strip 23 will match with the groove 121. When use, the front cover 1 is inserted into the back cover 2, such that both sides' edges of the frame 12 of the front cover 1 are slid into the interior walls of two sides' edges of the back cover 2 from the open end 21, and then the front cover 1 is pushed forward until the bottom wrap 13 engages with the open end 21, meanwhile the groove 121 of the front cover 1 engages with the waterproof strip 23 of the back cover 2 completely so as to perform a waterproof function. Optionally, the waterproof strip 23 and the groove 121 can be shifted by one another, i.e. the waterproof strip 23 can be disposed on edges of the frame 12 of the front cover 1, while the groove 121 corresponding to the waterproof strip 23 can be disposed in the interior walls of the two sides edges of the back cover 2 and the interior wall of the blind end 22. In this case, the sealing mechanism will be identical to the description hereinabove and will not be repeated any further herein.

As shown in FIGS. 6 and 7, the back cover 2 further comprises a second opening 24 corresponding to the headphone jack of the electronic device.

As shown in FIGS. 1, 2 and 3, the waterproof case further comprises a first sealing plug 3 and a second plug 4, wherein the first sealing plug 3 is used for plugging the first opening 131, and the second sealing plug 4 is used for plugging the second opening 24.

As shown in FIGS. 1, 2, 3, 8, and 9, the waterproof case further comprises an outer locking shell 5 to improve the waterproof performance. The outer locking shell 5 encloses the assembly formed by the front cover 1 and the back cover 2, and makes the two covers tight enough in order to achieve better waterproof performance.

For better tight connection between the outer locking shell 5 and the back cover 2, the outer locking shell 5 further comprises two lateral sides, each of which has a positioning slot 51 for fixing the outer locking shell 5 and the back cover 2.

Correspondingly, a positioning bulge 25 is disposed on each outer side wall of the back cover 2. When fixing the outer locking shell 5 to the back cover 2, the positioning bulge 25 will be inserted into the positioning slot 51 of the outer locking shell 5 for tight connection between the outer locking shell 5 and the back cover 2. The positioning slot 51 is likely a long narrow track, and the positioning bulge 25 is also long narrow-shaped.

Alternately, the positioning slot and the positioning bulge can be shifted by one another, i.e. the positioning bulge can be disposed on the inner rim of two lateral sides of the outer locking shell 5, and the positioning slot can be disposed in outer rim of both sides of the back cover 2. The matching mechanism will be identical to the description hereinabove and will not be repeated any more here.

According to the present invention, the outer locking shell 5 has an opening 52 corresponding to the charger port and headphone jack of the electronic device in order to use the electronic device conveniently upon fixing the outer locking shell 5.

According to the present invention, in order to improve the close fit between the open end 21 of the back cover 2 and the bottom wrap 13 of the front cover 1, the open end 21 is provided with multi-step grooves 211, and the bottom wrap 13 is also provided with multi-step raised platforms 133 corresponding to the multi-step grooves 211. The multi-step grooves 211 will be joined to the multi-step raised platforms 133 hermetically and the case can be sealed when in use.

According to the present invention, as shown in FIGS. 2, 3 and 4, the first sealing plug 3 is of L shape which is consisted of a horizontal plane member 31 and a vertical member 32. A locking bulge 311 is disposed on the inner wall of the horizontal plane member 31 to snap the back side of the bottom wrap 13. The vertical member 32 is of arc-shape corresponding to the curve side of the bottom wrap 13. A one-piece gasket 321 is disposed on the inner wall of the vertical member 32 to plug the first opening 131. Moreover, skid-proof strips 322 can be disposed on the outer side of the vertical member 32 in order to operate the first sealing plug conveniently.

As shown in FIGS. 3, 6 and 7, the second sealing plug 4 is a screw plug made of plastic or rubber.

A transparent lens plastic sheet 6 is provided on the back cover 2, corresponding to the camera of the electronic device. The transparent lens plastic sheet 6 is a post forming part in the back cover 2. A waterproof fabric 7 is also provided on the back cover 2, corresponding to the speaker of the electronic device. A transparent plastic sheet 8 is provided on the outer locking shell 5, corresponding to the camera and speaker of the electronic device. The transparent plastic sheet 8 is a post forming part in the outer locking shell 5.

According to the present invention, the frame 12 of the front cover 1 is made of soft material or hard material. Both the back cover 2 and the outer locking shell 5 can be made of hard material or soft material. The present invention can be made of inexpensive materials which are being currently used in the existing cases of electronic device in the current market.

An embodiment of the present invention may further comprise as follow:

This embodiment is substantially the same as the first embodiment described above. However, as shown in FIG. 10, the difference is that a square slot 14 is provided around the first opening 131, and the first opening 131 is within the square slot 14. The first sealing plug 3′ is embedded in the square slot 14, and can be slid within the slot 14 to seal the first opening. Moreover, skid-proof strips 31′ are provided on the outer surface of the plug in order to make the plug to slide easily.

An embodiment of the present invention may further comprise as follow, as shown in FIGS. 11, 12 and 13:

An embodiment of the present invention may further comprise:

-   -   (A) A front protective sheet cover 100, comprising:         -   a transparent sheet 110 at least covering and clinging to             the screen of the electronic device, whereby the screen of             the electronic device can be used or inputted through the             transparent sheet 110; the front sheet cover 110 has one             bottom opening that can accommodate the control button 140             corresponding to the key of the electronic device.         -   a frame with an edge 120 disposed around the transparent             sheet 110 to enclose the edges of the electronic device.             Along the perimeter of the edge of the frame 120, it             comprises multiple groove strips 121′. On the top the frame             120, it comprises the first opening 130 corresponding to the             headphone jack of the electronic device.     -   (B) a protective back cover shell, covering the entire back of         the electronic device, and encasing the electronic device around         the edges of the frame 120 of the front sheet cover 100,         comprising:         -   an inner back cover 200, covering the entire back of the             electronic device; wherein multiple waterproof tongue strips             221 are set up on the interior walls of along the interior             wall of the edge of the inner back cover 200, wherein the             front sheet cover 110 is inserted into the back cover after             having attached the electronic device onto the inner front             sheet cover 100, while the waterproof groove strips 121′ of             the front cover 100 completely engages with the waterproof             tongue strips 221 of the inner back cover 200 to perform the             waterproof function. As shown on FIG. 13, the protective             back cover shell 200 may further comprise an opening 230             corresponding to the opening 130 of the front sheet cover             100 and there is a second opening 240 corresponding to one             the ports of the electronic device.         -   an outer locking shell 300 as shown in FIG. 14, which is             made with hard material, providing sealing pressures along             the perimeter of the inner back cover 200 to assure the             waterproof functionality of the complete assembly of the             waterproof protective cover. The positioning slot 220 is to             assure the outer locking shell 300 to fit snuggly onto the             inner back cover 200, wherein the inner back cover 200 is             sealed in place onto the front cover 100 with tongue-groove             system. The outer locking shell 300 should be thick enough             to be able to provide good and strong pressures on the             perimeter of the inner back cover 200 wherein the inner back             cover 200 is sealed onto the front cover sheet 100 to             perform good waterproof functionality of the complete             protective case of the electronic device. Furthermore, the             outer locking shell 300 comprises first opening slot 320 and             second opening slot 330 correspond to the ports of the             electronic device so that the electronic device is             functioning as normal without any interference of the             protective case of the present invention. As shown in FIGS.             11 and 13, the opening slot 320 and the opening slot 330 are             sealed with the sealing plug 400 and the 500 respectively.     -   A transparent lens plastic sheet 600 is provided on the inner         back cover 200, corresponding to the camera of the electronic         device. The transparent lens plastic sheet 600 is a post-forming         part in the inner back cover 200. A waterproof fabric 700 is         also provided on the back cover 200, corresponding to the         speaker of the electronic device. A transparent plastic sheet         800 is provided on the outer locking shell 300, corresponding to         the camera and speaker of the electronic device. The transparent         plastic sheet 800 is a post-forming part in the outer locking         shell 300.     -   According to the present invention, the frame 120 of the front         cover 100 is made of soft material or hard material. Both the         inner back cover 200 and the outer locking shell 300 can be made         of hard material or soft material. The present invention can be         made of inexpensive materials which are being currently used in         the existing cases of electronic device in the current market.

The examples described above are preferred embodiments of the present invention only, and are not the limitation to the invention. Although the present invention has been described in detail with reference to the embodiments, for the skilled in the art, the embodiments described can still be modified or partly replaced equivalently. However, any modifications, equivalent substitutions, improvements made within the spirit and principle of the present invention should be included within the scope of the present invention. 

What is claimed is:
 1. A protective case for an electronic device, comprising: a front cover, comprising: a transparent sheet at least covering and clinging to the screen of the electronic device, whereby the screen of the said electronic device can be used or inputted through the transparent sheet; a frame disposed around the transparent sheet to enclose the edges of the electronic device, and a waterproof groove/strip is provided in the edges of the frame; and a bottom wrap wrapped the edge of the lower part of the frame, wherein the bottom wrap further comprises a first opening corresponding to the charger port of the electronic device and a control button corresponding to the key of the electronic device; a back cover at least covering the back side and the upper part of the electronic device, and encasing the electronic device along with the front cover, comprising: at least an open end and a blind end, wherein a waterproof strip/groove is set up on the interior walls of at least two sides' edges of the back cover, when the front cover is inserted into the back cover, both sides' edges of the frame of the front cover can be slid into the interior walls of two sides' edges of the back cover from the open end, and then the front cover is pushed forward until the bottom wrap of the front cover engages with the open end of the back cover, while the waterproof groove/strip of the front cover engages with the waterproof strip/groove of the back cover completely so as to perform a waterproof function; and a second opening corresponding to the headphone jack of the electronic device; a first sealing plug for plugging the first opening, and a second sealing plug for plugging the second opening.
 2. The protective case for an electronic device of claim 1, wherein a waterproof groove is provided in surrounding edges of the frame, and the waterproof strip corresponding to the waterproof groove is disposed in the interior walls of the two sides' edges of the back cover and the interior wall of the blind end of the back cover.
 3. The protective case for an electronic device of claim 1, wherein a waterproof strip is provided in surrounding edges of the frame, and the a waterproof groove corresponding to the waterproof strip is disposed in the interior walls of the two sides' edges of the back cover and the interior wall of the blind end of the back cover.
 4. The protective case for an electronic device of claim 1, further comprising an outer locking shell, wherein the outer locking shell encases the assembly formed by the front cover and the back cover, and makes the two covers tight enough in order to achieve better waterproof performance.
 5. The protective case for an electronic device of claim 4, wherein the outer locking shell further comprises two lateral sides, each of which has a positioning slot for fixing the outer locking shell and the back cover; While a positioning bulge is disposed on each outer side wall of the back cover, when fixing the outer locking shell to the back cover, the positioning bulge will be inserted into the positioning slot of the outer locking shell for tight connection between the outer locking shell and the back cover.
 6. The protective case for an electronic device of claim 5, wherein the said positioning slot of the said outer locking shell is a long narrow track; and the said positioning bulge of the said back cover is also long narrow-shaped.
 7. The protective case for an electronic device of claim 4, wherein the said outer locking shell further comprises two lateral sides, each of which has a positioning bulge for holding in place the said outer locking shell and the said back cover; while a positioning slot is disposed on each outer side wall of the said back cover, when placing the said outer locking shell to the said back cover, the said positioning bulge will be inserted into the said positioning slot for tight connection between the said outer locking shell and the said back cover.
 8. The protective case for an electronic device of claim 7, wherein the said positioning bulge of the said outer locking shell is a long narrow bulge, and the said positioning slot of the said back cover is also long narrow slot.
 9. The protective case for electronic device of claim 4, wherein the said outer locking shell has an opening corresponding to the charger port or headphone jack of the said electronic device.
 10. The waterproof case for electronic device of claim 1, wherein the open end of the said back cover is provided with multi-step grooves, and the said bottom wrap of the said front cover is also provided with multi-step raised platforms corresponding to the multi-step grooves, such that the said multi-step grooves can be joined to the said multi-step raised platforms hermetically and the said protective case can be sealed when in use.
 11. The protective case for electronic device of claim 1, wherein the first sealing plug is of L shape which is consisted of a horizontal plane member and a vertical member, wherein a locking bulge is disposed on the inner wall of the horizontal plane member to snap the back side of the said bottom wrap, and the vertical member is of arc-shape corresponding to the curve side of the said bottom wrap, wherein an one-piece gasket is disposed on the inner wall of the vertical member to plug the said first opening.
 12. The protective case for electronic device of claim 11, wherein the said skid-proof strips can be disposed on the outer side of the vertical member in order to operate the L-shaped plug conveniently.
 13. The protective case for electronic device of claim 1, wherein a square slot is provided around the said first opening; and the said first opening is within the square slot, wherein the said first sealing plug is embedded in the square slot and can be slid within the slot to seal the said first opening.
 14. The protective case for electronic device of claim 13, wherein the said skid-proof strips are provided on the outer surface of the plug in order to make the said plug to slide easily.
 15. The protective case for electronic device of claim 1, wherein the second sealing plug is a screw plug made of plastic or rubber.
 16. The protective case for electronic device of claim 1, wherein a transparent lens plastic sheet is provided on the said back cover, corresponding to the camera of the said electronic device, and the said transparent lens plastic sheet is a post-forming part in the said back cover.
 17. The protective case for electronic device of claim 1, wherein a waterproof fabric is also provided on the said back cover, corresponding to the speaker of the said electronic device.
 18. The protective case for electronic device of claim 1, wherein a transparent plastic sheet is provided on the said outer locking shell, corresponding to the camera and speaker of the said electronic device, and the said transparent plastic sheet is a post-forming part in the said outer locking shell.
 19. The protective case for electronic device of claim 1, wherein the frame of the said front cover is made of soft material or hard material.
 20. The waterproof case for electronic device of claim 1, wherein the said back cover is made of soft material or hard material.
 21. A waterproof case for electronic device, comprising: a front cover, comprising: a transparent sheet at least covering and clinging to the screen of the electronic device, whereby the screen of the said electronic device can be used or inputted through the transparent sheet; a frame disposed around the transparent sheet to enclose the edges of the electronic device, and a waterproof groove/strip is provided in the edges of the frame; and a protective back cover shell, covering the entire back of the electronic device, and encasing the electronic device around the edges of the front sheet cover, comprising: an inner back cover, covering the entire back of the electronic device; wherein a waterproof tongues are set up on the interior walls of along the edges of the inner back cover, wherein the front sheet cover is inserted into the back cover after having attached the electronic device onto the front sheet cover, while the waterproof grooves of the front sheet cover completely engages with the waterproof tongues of the back cover to perform the waterproof function. an outer locking shell, which is made with hard material, providing sealing pressures around the sides of the inner back cover to assure the waterproof functionality of the complete assembly of the waterproof protective cover. The outer locking shell should be thick enough to be able to provide good pressures to perform good waterproof functionality of the complete protective case. a first sealing plug for plugging the first opening, and a second sealing plug for plugging the second opening.
 22. The protective case for electronic device of claim 21, wherein the said protective case having an outer locking shell and the said outer locking shell encases the assembly formed by the said front sheet cover and the said back shell cover, and makes the said two covers tight enough in order to achieve better waterproof performance.
 23. The protective case for electronic device of claim 21, wherein the said outer locking shell having one or more openings corresponding to the charger port or headphone jack of the electronic device.
 24. The protective case for electronic device of claim 21, wherein the said protective case having a sealing plug that is made of waterproof plastic or rubber stopper.
 25. The protective case for electronic device of claim 21, wherein the said protective case having a waterproof fabric on the opening of the said back cover, corresponding to the speaker of the said electronic device.
 26. The protective case for electronic device of claim 21, wherein the said protective case having a transparent plastic lens on the said outer locking shell, corresponding to the camera and speaker of the said electronic device, and the transparent plastic lens is a post-forming part in the said outer locking shell.
 27. The protective case for electronic device of claim 21, wherein the said frame of the said front cover is made of soft material or hard material.
 28. The protective case for electronic device of claim 21, wherein the said back cover is made of soft material or hard material. 